抄録
In order to improve interfacial properties of an adherend of the bonded composites joints, in-mold surface preparation using imprint lithography is proposed. In the proposed method, microstructures are fabricated on the surface of the mold for forming composite materials. By forming composites on the mold, the shape of microstructures is transferred to the CFRP surface. In this method, since molding of composites and surface preparation can be conducted at once, it reduces the time required and costs involved in conventional surface preparation such as sand blasting, chemical etching etc In this paper, micro concavo-convex structures are fabricated on the surface of CFRP by in-mold surface preparation to improve the apparent mode I fracture toughness of CFRP/adhesive interface According to DCB tests, it was confirmed that the fracture toughness became stronger and fracture mode changed from interfacial failure to cohesive failure of adhesive as the aspect ratio A of microstructures increased.
